Filter press and filter plate therefor



` Jun@ 17, 1924., mgms C. C. HLUM FILTER PRESS AND FILTER PLATE THEREFORFiled July 17. 1920 cated, m

' tration in a single press.

Patented ,lune l?, l92d. Y

lihli@ STATES l tisana rarer/ir erstes;

CHARLES c. Amann, or cm'rm, rnimsvnvanm, .assrenon To n I. nu Pour DENmcuns a companion WILMINGTON, DELAWARE, v.a CORPORATION or DELA- WARE.

FILTER PRESS AND FILTER PLATE THEREFOR Application led July 17,

To all 'whom z't may concern:

Be it known that l, CHARLES C; AHLUM, a

citizen of thevUniited States, and a resident of Chester, in the countyof Delaware and State of Pennsylvania, have invented a certain new anduseful Filter Press and Filter Plate Therefor, of which the following isa specification. v

This invention relates to a filter press, and to a filter plate for usetherein and in similar presses.

There are many materials, especially those of a colloidal nature, whichit is not possible to completely filter or clari in a single passagethrough the usual fi ter press, when working at a normal and economicalrate 'of filtration. Using a multiplicity of cloths between the framesand plates of the press only slightly improves clarification, Whilefiltration is .im eded to avery marked degrec, making it anuneconomical, and in some cases, an impracticable procedure. Thisdifficulty is usually overcome by filtering the liquid twice, firstthrough one press to remove most of the solids, and then through a'second press to .secure clarification. This practice of filtering by twoseparate presses is, however, subject to various objections, such ascomplication of apparatus, and so forth.- l have devised a press wherebydouble filtration can be conveniently and readily carried on in a singlepress, and have also devised a 4filter plate for use as a plate of saidpress.

One object of the invention is to providev a filter press havin@r meansintermediate the endso its rank of gfilter units, e. g., its lates andframes, for transferring the trate 'from one portion o the rank totheinlet conduit of another portion of the rank, whereby the material to befiltered can be first filtered in the one portion of the rank, and theresulting filtrate thenv clarified in the, other portion of rank, givingdouble fil- Another object is to provide a filter late for insertionintermediate the ends o the rank of filter units of a press, and havingmeans for transferring the filtrate from oneportion of the rank to theinlet conduit o theA other portion of the rank.

' To these ends, and also to improve geneially upon devices of thecharacter indiinvention consists in the various latters ereinafterdescribed and Claimed.

192e. serial no. 396,942.

Without restricting my invention thereto, I describe the same byreference to the embodiments thereof illustrated in the accompanyingdrawings. In these drawings Figure 1 is a plan view of'a filter pressembodying my invention;

Figure 2 is an elevational view of the press illustrated in Figure 1,certain portions being broken out approximately on a plane extendingdiagonally from the front ower corner'to the back upper corner of therankv of plates and frames, to show the `interior construction, anddetailed showing of the contours oi the drainagev faces of the plates,being omitted for simplicity;

Figure 3 is a face view of the transferring filter plate, forming afeature ofmy inven tion and such as is embodied in the illustratedpress, the-,plate being viewed looking in the direction of the arrows 3,3 in Figure 2; i I Figure 4 is an approximately ydiagonal section of thetransferring filter plate, taken substantially on the line 4-4 of Figure3v ang looking in the direction of the arrows, an

Figure 5 isa fragmental side elevation of la press having a somewhatmodied transfer plate, the corner of the plate, and the immediatelyadjacent parts, beingI broken out, and the exterior piping of the platebe' ing omitted, the better to show the construction. f

Figures 1, 2 and 5 are somewhat diagrammatic and conventional incharacter.

Referring now to the drawings and, for the present, more particularly toFigures l .to 4 The illustrated press comprises a rank of filterunits'composed of iilter plate units 1 and l, and distance, or cakeframe, units 2, carried on the side bars 3 by the supportving lugs 4. Aswill be understood by those skilled in the lter press art, the filterplates are provided on their faces with ribs, nubs, or equivalentcontour to furnish bothsupports for the filter cloth at intervals overlts surface, and channels or grooves for draining the face of the plate,similar to the face '1 shownin Figure 3 where the plate has nubs 15Y andgrooves 15x; `while the cake frames are but open iframes without faces,and havma i ing provisions, at the passages 9 shown as at the cornersofthe frames in Figures 1 and 2, for admitting material'to the trames.ln c practice filtering medlums, as filter cloths or bibcoclr, type.

`and a follower 6, each in the character of alialf-plate with itsdrainage'face facing the adjacent frame, form the end units of the rank.A series of apertures or through pas# sages, 7, one in the corner ofeach plate and framethe top rear corner as shovvn in the dravvin fornian inlet conduit 8, this conduit being directly connectedvvith theinterior of the frames loy the passages 9. Pref; erably', the plates 1are of the closed delivery type and the plates 1al of the open delivery,An outlet conduit 10 is provided by apertures 11 in the lower frontcorners of the closed delivery plates 1 and the associated 4frames 2,and is connected with each drainage lface of such plates by passages 12,the interiors .of the framesloeing in communication with the conduit 10only indirectly, i. e. hy Way of the passages 12 in the plates (and thelter cloths) The plates 1 are provided with bilococks 13 each connectedwith the drainage faces of the plates hy the passages 1&1. 'lliestructure as thus far descriloed will loe understood by those slrilledin the art Without extended description, its details not involving theprimary features of my invention. lt is toY he noted, liovvever, that.by the use of the closed delivery plates l provide for the collection ofthe various nitrates from the plates 1; the particular virtue thereof,in connection with my invention, will appear as this descriptionproceeds.

According to 4thel present invention, the press comprises, in lieu ofone of the usual plates of such a press, a transfer member15,'constructed in accordance with .the in vention and located loetvveentwo of the frames of, and intermediate the length of, the rank of platesand frames. The illustrated niemlcer 15 is in the character of atransfer plate, or double-faced transferring filter plate havingdrainage faces lo and 15b, that is, surfaces orfaces of a character land also communicates with the ydrainage face 15G. At its other engl, orport, 16"", the

passage lo communicates 'with the conduit The tvvo ports 16a and` 16bface oppo sitely and, as illustrated, are out of alignn inceste ment andsubstantially diagonally'sspaced on. the plate, the port '16' opening onthe man gin surrounding the face 15b atjthe upper rear corner thereof.The meml e`r 15 has no aperture, such as an aperture 7, to serve as acontinuing unit of the inlet passage 8; instead of having such anaperture, it divides the -inlet conduit Slinto two distinct portions, 8aand 8", the one 8a, serving only the section A of the press and theother, 8, serving only the section B of the press.

With this arrangement, the memloer 15, itself serving as a filter platefor both 'the section A and the section lB, transfers the filtrate,collected from the section A and dcrived from the solution to loetiltered which is fed in through the entrance ipe l?, to the portion 8lof the inlet con uit. From the portion 8h the filtrate from the sectionA passes to the frames of the section B and is claried. llius the press,by virtue of the present invention, performs douhle filtration, allcomplication ofapparatus, and of manipulation, incident to the useoftvvo dist-inet presses being overcome and eliminated.

ln the illustrated transfer plate 15 the transfer passage 16, forconvenience, lies in part in the loody of the plate, as indicated at 16and is in part composed of an exterior pipe 16d. rllliis portion 16@since it is exterior of the plate provides for the convenientinstallation of the valves 17 and 18.

With these valves, hy closing ofthe valve 17 and opening of the valve 18the tlcvv of dltrate from the section A can he directed the section ll,or, if desired, loy closing of the valve 18 ando ening the valve 17, the

lll@

said filtrate can oe Withdrawn y"Witl'iont passing it through thesection B. An largement 16a of the port 16u of the transfer passage 16provides for the ilovv of liltrate from the face 15a to the passage 1d,or, in effect, to the conduitl. A passage 19, provided at its outletwith. a loilococlr 20 and connected with the face 15b, provides for 'theflovv of clarified filtrate from the face 15".

Although the illustrated press comprises plates and frames, rather than.reces plates, and has side, rather than center, feed provisions, itwill loe understood that the in vention isapplicable to recessed platesto center delivery constructions. Also, preferred, the section ll oftliejpress may have closed, rather than open, delivery' plates. Forconvenient use with closed de liverv plates in the section ll, ldesiralaly (see TFigure 5) provide the plate i5 with passage 21connecting the passage 19 with the margin of the `lace 15b at its lowerforward corner and in position to register vvitli vthe endof the conduit22 which, hy Way the passages 23, collects the clarified filtrate tromthe closed delivery plates. As vvlll understood, vvlien a plate 15,having the passage 21, is used with open delivery plates, the passagesopen end is closed by the margin of the abutting frame which, of course,and as in Figures 1 and 2, has no delivery` conduit section in it. Thusa plate with both the passage 19 and the passage 21 isv adapted to servewith either open or closed delivery units in the section B.

In operation, filter cloths of any particular type desired are placedthroughout the length of the press to lie between the plates and` cakeframes and overlie the various drainage surfaces of the plates thematerial to be filtered is fed in'under suitable head through the pipeP, section 8a of the conduit 8, and passages 9, and the filtrate drainsinto the conduit 1() through the passages 12; all as will be understoodby those skilled in the art. In accordance with the invention, thefiltrate collecting in the conduit 10 is passed through the passage 16of the transferring member (the valve' 17 being closed and the valve 18open) and into the section 8b of the conduit 8, whence it is deliveredto the cake frames between the plates l? and is filtered through thecloths. The clarified filtrate is drawn ofi' through the bibcock 20 andthe bibcocks 13 ('Figs. 1 and 2) or is collected in the conduit 22 (Fig.5) and vdischarged through the passage 21-19 and the bibcock 20,depending on whether open delivery or closed delivery plates are used inthe sectionB of the press.

I claim:

1. In a filter press, in combination, a 'rank of plates and frameshaving an inlet provision, and an outlet provision for filtrate, and

a transferring filter plate inserted i'n said rank between two of saidframes, in lieu of a usual plate of such a rank, and dividing the rankinto two sections, such transferring plate being provided with meansconnecting the filtrate outlet provision of one section with the inletprovision of the other section whereby filtrate from the said onesection may be transferred to, and clarified in, the other said section.

2. In a filter press, in combination, a rank of plates and frames havingan inlet provision, and an outlet provision for filtrate, and

.a transferring filter plate inserted in said rank between two of saidframes, in lieu of a usual plate 0f such a rank, and dividing the rankinto two sections, with one of said sections comprising a plurality offilter units, said inlet and outlet provisions p'roviding for supply ofliquid to such plurality of units and the collection of the individualfiltrates therefrom, such transferring plate being provided with meansconnecting the filtrate outlet provision of the said one section withthe inlet provision of the other section whereby filtrate from the saidone section may be transferred to, and clarified in, the other saidsection.

rank into two sections, such transferring plate being provided withmeans connecting the filtrate outlet provision of one section with theinlet prov'1s1on of the other section whereby filtrate from the said one`section may be transferred to, and`clarified in, the other saidsection. v

4. In a filter press, in combination, a rank of plates and frames havingan inlet provision, and an outlet provision for filtrate, and atransferring device inserted in said rank between two of said frames, inlieu of a usual plate of such a rank, and dividing the rank intosections with one section comprising a plurality of cake frames, saidinlet provision directly communicating with the interior of each of suchframes, such transferring device being provided with means connectingthe filtrate outlet provision of the said one section with the inletprovision of the other section whereby filtrate from the said onesection may be transferred to, and

-clarifed in, the other said section.

5. In a filter press, in combination, a rank of plates and frames havingan inlet provision, andan outlet provision for filtrate, and atransferring device inserted in said rank between two of said frames, inlieu of a usual plate of such a rankgand dividing the rank into sectionswith one section comprising a plurality of cake frames, said inletprovislon directly communicating with'the interior of each of suchframes, and said outlet provision communicating only indirectly with theinterior of 'each of such frames, such transferring device beingprovided with means connecting the filtrate outlet provision of the saidone section with the inlet trate from the said one section may betransferred to, and clarified in, thc yother said.

section.

6. In a filter press, in combination, a rank of plates and framesadapted for the insertion of filtering mediums between the plates andframes, having an inlet provision, and

an outlet provision for filtrate, and a transferring filter plateinserted in said rank between two of said frames, in lieu of-a usualplate of'such a rank, adapted for cooperation with the filtering mediumto be received between such transferring plate-and the immediatelyadjacent frame and dividing the rank into two sections with onesectioncomprising a plurality ot caire trames, said inlet provision directlycommunicating with the interior of each of such iFrames and said out letprovision communicating only indirectly and by way of said lteringmediums with the interior oi each otsuch frames, such transferring iplate being provided with means connecting the liltrate outlet provisionof the said one section with the inlet provision ci the other sectionwherebyiiltrate from the said one section may be transerred to, andclarified inthe other said section.

7'. lin a tilter press, in combination, a series oi lter unitspresenting two sections and having means presenting an inlet conduit forsaid series and also having means presenting an outlet conduitl for asection of said series, and a transferring member located between two ofsaid units and between the adjacent ends of said sections, saidtransferring member having a portion thereof located and positioned tointerrupt said inlet conduit and thereby divide the same into separatelengths, and said transferring member also having a transfer passagelocated relatively to the body of said member, and to the units betweenwhich said member' is inserted, in position to connect the outletconduit, of the section having the same, with the portion ot said inletconduit lying at the other side oi" said member from such section,whereby tiltrate from such section may be transferred from such sectionto the portion of said inlet conduit feeding the other section,

8. lin a lilter press, in combination, a se p ries ot plates and tramesadapted tor the insertion ot ltering mediums between the plates andtrames, presenting two sections and having means presenting an inletconduit for said series and also having means presenting an outletconduit for a section of said series, and a transferring lilter platelocated between two oi said frames and between the adjacent ends of saidsections, said transferring plate being contoured on each side to give adrainage surface adapting said plate for cooperation with the iilteringmedium to be received between such transferring plate and theimmediately adjacent frame, said plate having a portion thereof locatedand positioned to interrupt said inlet conduit and thereby divide thesame into separate lengths, and said transferring plate also having atransfer passage located rela-` tively to the body ot said plate, and tothe trames between, which said plate is inserted, in position to connectthe outlet conduit, of the section having :the same, with the portionyof said inlet conduit lying at the other side of said plate from suchsection, whereby filtrate from such section may be transferred from suchsection to the portion of said inlet conduit feeding the other section,

nei-.caste 9,. As an article of manufacture, a trans iter member tor usein a lter press, corr toured for insertion between iilter units oli apress and for cooperation with `each ci' the units between which it maybe inserted, and provided with a port opening upon and primarilycommunicating with one side only oi the member, a port opening upon andprimarily communicating with the other side only oig the member, and atransfer passage connecting said two ports,

l0. As an article oif manufacture, a trans fer member for use in a hlterpress, contoured tor insertion between iilter units ci a press and forcooperation with each oi the units between which it may be inserted, andprovided with a port opening upon and primarily communicating with oneside only ot the member, a port opening upon and primarily communicatingwith the other sine only oi the member, and a transfer passageconnecting said two ports such transier passage being provided in partby piping lying exterior oi the body oit the member.

l1. As an article oiE manufacture, a trans fer plate for use in a iilterpress, contoured to present a drainage surface and tor sertion betweenfilter units of a press for co-operation with each oi the units tweenwhich it may be inserted, provi@ d with a pair of separate and distinctp rily non-communicating ports one opel upon one side of the member andthe o upon the other, provided with a tra'ce passage connecting said twoports, and also provided with a passage for conveyi g uid from saiddrainage surface to o i rior of said plate. l2. As an article cimanufacture, a tra ferring filter plate, contoured on each to give adrainage surface, provided wH 'fr port primarily communicating withdrainage surface of only one side, provided with a port primarilycommunicating with the face oi only the other side, and provided with atransfer passage connecting said two ports. l

i3. As an, article of manufacture, a transferring iilter plate,contoured on each side to give a drainage surface, provided with portprimarily communicating with the drainage suriace ci' only one side,provided with a port primarily communicating with the face of only theother side, and provided with a transfer passage 'connecting said twoports such transfer passage being provided in part by piping lyingexterior of the body of the member.

la. As an article of manufacture, a transterring iilter plate havingeach face presenting a recess for receiving filtrate therein to providefor draining of the hltrate across said tace, said plate being providedwith a port primarily communicating with one face only, provided with aport primarily cour CIK "lil

Dr: du

lil@

llll

llS

municating with the other face only, and provided with a transferpassage yconnecting said two ports. f

l5. As an article of manufacture, a transferring filter plate havingeach face presenting a recess for receiving filtrate therein tol providefor draining of the ltrateacross l said face and also presenting anupstanding ortion for the support of a filtering meium, saldplate beingprovided with a port primarily communicatingl with one face only,provided with a port primarily communicating with the other face only,and provided with a transfer passage connecting said two ports. p

16. As an article of manufacture, a transferring filter plate, contouredon one sideto give a drainage surface and on the other side to give adrainage surface and a surrounding margin t-herefor, provided with aport communicating with the drainage surface of the said one side,provided with a port' communicating with the margin of the said otherside, and in non-communication with the drainage surface of such side,and provided with a transfer passage connecting said two ports. Y

17.' As an article of manufacture, a substantially rectangulartransferring filter age surface and on the other side to give a drainagesurface and a surrounding margin therefor, provided with a portcommunicatin with the draina e surface of the said one si e and locatedsu stantiallyat one corner thereof, provided with a port communicatingwith the margin of thesaid other side and located substantially at adifferent corner of said plate than is said first named port, andprovided with a transfer passage connecting said two ports.

1 8. -As an article of manufacture, a sub stantially rectangulartransferring filter plate, contoured on one side to give a drainagesurface and on the other side to give a drainage surface and asurrounding margin therefor, provided with4 a port communicating withthe drainage surface of the said one side and located substantially atone corner thereof,provided with a port communicating with the margin ofthe said other side, and located substantially at a corner of said platediagonally opposite said first named corner, and provided with atransfer passage connecting said two ports.

In testimony `whereof I aliix my signature. v

CHARLES C. AHLUM.

